Author, Institution: Dalia Čalnerytė, Kaunas University of Technology
Science Area, Field of Science: Physical Sciences, Informatics – 09P
Scientific Supervisor: prof. habil. dr. Rimantas BARAUSKAS (Kaunas University of Technology, Physical Sciences, Informatics, 09P).
Dissertation Defence Board of Informatics Science Field:
Prof. Dr. Habil. Minvydas RAGULSKIS (Kaunas University of Technology, Physical Sciences, Informatics – 09P) – chairman;
Prof. Dr. Romas BARONAS (Vilnius University, Physical Sciences, Informatics – 09P);
Prof. Dr. Habil. Rimantas KAČIANAUSKAS (Vilnius Gediminas Technical University, Physical Sciences, Informatics – 09P);
Prof. Dr. Gintaras PALUBECKIS (Kaunas University of Technology, Physical Sciences, Informatics – 09P);
Prof. Dr. Miguel A. F. SANJUAN (Rey Juan Carlos University, Physical Sciences, Informatics – 09P).
The Doctoral Dissertation is available and at the libraries of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas) and Vytautas Magnus University (K. Donelaičio g. 52, Kaunas)
Annotation:
Artificial composite materials are widely used in manufacturing products in various areas. However, the numerical simulation of the mechanical behavior of the objects made of composites by taking into account their microstructure requires unrealistically large computational resources if the finite element method is applied. The objective is to obtain practically acceptable results with a model that has a small number of finite elements. The multi-scale models are employed in the dissertation. The equivalent material parameters are calculated in the minute scale with respect to the representative region that takes into account the internal structure of the composite. The obtained parameters are used in the analysis of the object in the largest scale. The extension of the methodology applied in order to obtain the equivalent parameters in the minutest scale which allows to mathematically define the element erosion criterion is proposed in the dissertation. The models are verified by analyzing the homogeneous material model under the loads in the composite plane and under the transverse impact of the rigid sphere and comparing the obtained results with the base model. The multi-scale model is verified by analyzing the influence of the internal structure of a 3D-printed item and comparing the numerical and experimental results.
